CN112944593B - Air conditioner and defrosting control method thereof - Google Patents
Air conditioner and defrosting control method thereof Download PDFInfo
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- CN112944593B CN112944593B CN202110191886.2A CN202110191886A CN112944593B CN 112944593 B CN112944593 B CN 112944593B CN 202110191886 A CN202110191886 A CN 202110191886A CN 112944593 B CN112944593 B CN 112944593B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention relates to the technical field of air conditioners, particularly provides an air conditioner and a defrosting control method thereof, and aims to solve the technical problems of single defrosting control method and poor heating efficiency in the prior art. The defrosting control method of the invention comprises the following steps: after the defrosting mode is exited, accumulating the defrosting interval time; before the accumulated defrosting interval time reaches the preset defrosting interval time, if a special working mode is started, the accumulation is suspended and the current accumulated defrosting interval time is stored; after the special working mode is exited, the current accumulated defrosting interval time is shortened; and continuing to accumulate by taking the shortened accumulated defrosting interval time as a starting point until the preset defrosting interval time is reached, and starting the defrosting mode. The actual accumulated defrosting interval time is larger than the preset defrosting interval time, namely, the time interval between two adjacent defrosting modes is prolonged. Compared with the traditional defrosting control method, the defrosting time in the same operation time is reduced, and the heating energy efficiency of the air conditioner is improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides an air conditioner and a defrosting control method thereof.
Background
As a device capable of adjusting the indoor environment temperature, the air conditioner has the working principle that: the indoor environment temperature is lowered or raised by the refrigerant switching between the circulation lines through the high pressure/low pressure/gas/liquid state, namely, the air conditioner is in the cooling or heating working condition from the perspective of the indoor unit. When the air conditioner heats the operation, if outdoor coil pipe temperature under certain humidity condition crosses lowly can lead to the condition of frosting, and outdoor coil pipe frosting can lead to outdoor heat exchanger's heat exchange efficiency to reduce, influences the heating effect of air conditioner, reduces indoor environment's travelling comfort, influences user experience. Therefore, in the situation that the air conditioner is in the heating working condition, the outdoor coil of the air conditioner needs to be defrosted timely and effectively.
The conventional defrosting mode of the air conditioner is periodic defrosting, namely, the defrosting interval time is accumulated from the start of a heating mode of the air conditioner, defrosting is started after the accumulated defrosting interval time reaches the preset defrosting interval time, and the accumulated defrosting interval time is started again after defrosting is finished for entering the next defrosting mode, so that the periodic defrosting is circulated until the heating mode is exited.
The defrosting control method is single, and although the defrosting control method can play a defrosting role to a certain extent, the indoor unit serves as an evaporator in the defrosting mode, and the indoor environment temperature cannot be increased, so that the heating energy efficiency of the air conditioner is influenced.
Disclosure of Invention
In order to solve the technical problems of single defrosting control method and poor heating efficiency of the existing air conditioner, the invention provides a defrosting control method of the air conditioner on the one hand.
The defrosting control method comprises the following steps: after the defrosting mode is exited, the defrosting interval time is accumulated; before the accumulated defrosting interval time reaches the preset defrosting interval time, if a special working mode is started, the accumulated defrosting interval time is suspended and the current accumulated defrosting interval time is stored; after the special working mode is exited, the current accumulated defrosting interval time is shortened; and continuing to accumulate by taking the shortened accumulated defrosting interval time as a starting point until the preset defrosting interval time is reached, and starting the defrosting mode.
In a preferable embodiment of the present invention, the step of "shortening the current accumulated defrosting interval time" includes the steps of: determining the running time of the special working mode; shortening the current accumulated defrosting interval time by the following formula;
t as ＝t bs -at s
wherein, t as Representing the shortened cumulative defrost interval time, t bs Representing the current cumulative defrost interval time, t s Represents the operating duration of the special operating mode and a represents a constant greater than 1.
In a preferable aspect of the above defrosting control method of the present invention, the defrosting control method further includes the steps of: when the accumulated defrosting interval time reaches the preset defrosting interval time, acquiring outdoor environment temperature and outdoor unit defrosting temperature; comparing the magnitude relation between the outdoor ring temperature and the outdoor ring temperature threshold; comparing the magnitude relation between the outdoor unit defrosting temperature and the outdoor unit defrosting temperature threshold; and determining whether to start a defrosting mode or not according to a comparison result of the outdoor environment temperature and the defrosting temperature of the outdoor unit.
In a preferable aspect of the above defrosting control method of the present invention, the defrosting control method further includes the steps of: when the comparison result of the outdoor ring temperature and the defrosting temperature of the outdoor unit meets the condition of starting a defrosting mode, determining the comparison times of the outdoor ring temperature and the defrosting temperature of the outdoor unit; when the comparison times are one time, the step of obtaining the outdoor environment temperature and the defrosting temperature of the outdoor unit is returned after the air conditioner is kept to operate in the current working mode for a preset time; when the comparison times are two, the defrosting mode is started.
In a preferable embodiment of the defrosting control method of the present invention, the determining whether to activate the defrosting mode according to a comparison result between the outdoor ambient temperature and the outdoor unit defrosting temperature includes: when T is o ≥T os1 And T c ≤T cs1 When the defrosting mode is started, the defrosting mode is started; wherein, T o Represents the outdoor ambient temperature, T c Representative of the defrost temperature, T, of the external unit os1 Represents a first outdoor ambient temperature threshold, T cs1 A first outdoor unit defrost temperature threshold.
In a preferable embodiment of the defrosting control method of the present invention, the step of determining whether to start the defrosting mode according to a comparison result between the outdoor ambient temperature and the outdoor unit defrosting temperature includes the steps of: when T is os2 ≤T o <T os1 And T c ≤(bT o -c)/d, defrost mode is initiated; wherein, T os2 Represents a second outdoor ring temperature threshold, b, c and d all represent constants, and T os1 >T os2 。
In a preferable embodiment of the defrosting control method of the present invention, the determining whether to activate the defrosting mode according to a comparison result between the outdoor ambient temperature and the outdoor unit defrosting temperature includes: when T is os3 ≤T o <T os2 And T c ≤(T o -e)/f, the defrost mode is activated; wherein, T os3 Represents the third chamber outer annular temperature threshold, e and f both represent constants, and T os2 >T os3 。
In a preferable embodiment of the defrosting control method of the present invention, the determining whether to activate the defrosting mode according to a comparison result between the outdoor ambient temperature and the outdoor unit defrosting temperature includes: when T is o <T os3 And T c ≤T cs2 When the defrosting mode is started, the defrosting mode is started; wherein, T cs2 Represents a second external machine defrost temperature threshold, and T cs1 >T cs2 。
In a preferable embodiment of the above defrosting control method of the present invention, the special operating modes include an oil return mode, a self-cleaning mode, and a high-temperature sterilization mode.
The defrosting control method comprises the following main steps:
after the defrosting mode is exited, accumulating the defrosting interval time;
before the accumulated defrosting interval time reaches the preset defrosting interval time, if a special working mode is started, the accumulation is suspended and the current accumulated defrosting interval time is stored;
after the special working mode is exited, the current accumulated defrosting interval time is shortened;
and continuing to accumulate by taking the shortened accumulated defrosting interval time as a starting point until the preset defrosting interval time is reached and then starting the defrosting mode.
The defrosting control method of the invention combines the actual working condition of the air conditioner, if the special working mode is started during heating, the accumulated defrosting interval time is suspended, and after the special working mode is exited, the accumulated defrosting interval time is continued until the accumulated defrosting interval time reaches the preset defrosting interval time by taking the shortened accumulated defrosting interval time as a starting point, so that the actual accumulated defrosting interval time is greater than the preset defrosting interval time, namely the time interval between two adjacent defrosting modes is prolonged. Compared with the traditional defrosting control method, the defrosting control method reduces the defrosting times of the air conditioner in the same operation time, and improves the heating energy efficiency of the air conditioner.
In another aspect, the present invention further provides an air conditioner, and a controller of the air conditioner is configured to execute the above defrosting control method.
It should be noted that the air conditioner of the present invention has all the technical effects of the above-mentioned defrosting control method, and those skilled in the art can clearly understand from the foregoing description, so that the detailed description is omitted here.
Drawings
FIG. 1 is a flow chart of the main steps of the defrosting control method of the air conditioner of the present invention;
FIG. 2 is a flowchart illustrating the detailed steps of a first embodiment of a defrost control method for an air conditioner according to the present invention;
FIG. 3 is a flowchart illustrating the detailed steps of a second embodiment of the defrosting control method of the air conditioner according to the present invention;
fig. 4 is a flowchart illustrating the detailed steps of a third embodiment of the defrosting control method of the air conditioner according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides an air conditioner, which comprises three basic working modes of refrigeration, heating and defrosting, and also comprises a special working mode, wherein the special working mode mainly comprises working modes of oil return, self-cleaning, high-temperature disinfection and the like.
It should be noted that the special operation mode of the air conditioner of the present invention is not limited to the three operation modes of oil return, self-cleaning and high-temperature sterilization, and other operation modes of the air conditioner with the same refrigerant flow direction as the heating and defrosting modes also fall into the special operation mode.
The conventional defrosting mode of the air conditioner is periodic defrosting, namely, the defrosting interval time is accumulated from the start of a heating mode of the air conditioner, defrosting is started after the accumulated defrosting interval time reaches the preset defrosting interval time, and the accumulated defrosting interval time is started again after defrosting is finished for entering the next defrosting mode, so that the periodic defrosting is circulated until the heating mode is exited. The defrosting control method is single, and although the defrosting control method can play a role in defrosting to a certain extent, the indoor unit serves as an evaporator in the defrosting mode, and the indoor environment temperature cannot be increased, so that the heating energy efficiency of the air conditioner is influenced.
Therefore, the invention also provides a defrosting control method which is applicable to the air conditioner and is executed by the controller of the air conditioner. The main steps of the defrosting control method of the air conditioner according to the present invention will be described in detail with reference to fig. 1.
Referring to fig. 1, the defrosting control method of the present invention includes the following main steps:
after the defrosting mode is exited, accumulating the defrosting interval time;
before the accumulated defrosting interval time reaches the preset defrosting interval time, if a special working mode is started, the accumulation is suspended and the current accumulated defrosting interval time is stored;
after the special working mode is exited, the current accumulated defrosting interval time is shortened;
and continuing to accumulate by taking the shortened accumulated defrosting interval time as a starting point until the preset defrosting interval time is reached and then starting the defrosting mode.
The defrosting control method of the invention combines the actual working condition of the air conditioner, if the special working mode is started during heating, the accumulated defrosting interval time is suspended, and after the special working mode is exited, the accumulated defrosting interval time is continuously accumulated until the accumulated defrosting interval time reaches the preset defrosting interval time by taking the shortened accumulated defrosting interval time as a starting point, so that the actual accumulated defrosting interval time is greater than the preset defrosting interval time, namely, the time interval between two adjacent defrosting modes is prolonged. Compared with the traditional defrosting control method, the defrosting control method reduces the defrosting times of the air conditioner in the same operation time, and improves the heating energy efficiency of the air conditioner.
For easy understanding, referring to fig. 2 to 4, the defrosting control method of the air conditioner according to the present invention will be described in detail with reference to three embodiments. Fig. 2 to 4 are detailed flowcharts of first, second and third embodiments of a defrosting control method of an air conditioner according to the present invention, respectively.
The first embodiment:
referring to fig. 2, the defrosting control method of the present embodiment includes the steps of:
s10, after the defrosting mode is exited, accumulating defrosting interval time;
and S11, judging whether the accumulated defrosting interval time reaches the preset defrosting interval time or not, if so, executing the step S12, otherwise, executing the step S18, namely, starting the defrosting mode.
It should be noted that the preset defrosting interval time is usually preset in the controller before factory shipment, and a specific value thereof depends on performance parameters such as power of the air conditioner, and a person skilled in the art sets the defrosting interval time according to actual conditions based on meeting the defrosting requirement of the air conditioner, for example, the preset defrosting interval time may be 2 hours.
And S12, judging whether the special working mode is started or not, if so, executing the step S13, and otherwise, returning to the step S11.
And S13, pausing the accumulation and storing the current accumulated defrosting interval time.
For example, taking the preset defrosting interval time as 2 hours as an example, the cumulative defrosting interval time reaches 50 minutes when the special operation mode is started, and the time is stored as the current cumulative defrosting interval time.
And S14, exiting the special working mode.
It should be noted that the starting and exiting conditions of the special operating mode depend on performance parameters such as power of the air conditioner, and the starting and exiting conditions are usually preset in the air conditioner, and the corresponding special operating mode is started when the starting conditions are met, and the corresponding special operating mode is exited when the exiting conditions are met.
And S15, determining the running time of the special working mode.
The operation duration of the special operation mode is different according to the specific implementation function, that is, the operation durations of the oil return mode, the self-cleaning mode and the high-temperature disinfection mode are different, the respective operation durations are preset in the controller under normal conditions, and the specific value is only required to be called from the controller in step 15.
S16, shortening the current accumulated defrosting interval time by the following formula:
t as ＝t bs -at s
wherein, t as Representing the shortened cumulative defrost interval time, t bs Representing the current cumulative defrost interval time, t s Representing the operating duration of the special operating mode and a representing a constant greater than 1.
It should be noted that the specific values of the operation duration and the constant a of the special operation mode in the above formula are different for different special operation modes, and the operation duration t is the same as the above operation duration t s A preset value in the controller may be called. The value ranges of the constant a in the three special working modes are described below by taking oil return, self-cleaning and high-temperature disinfection as examples. The method comprises the following specific steps:
in the oil return mode, the value range of a is greater than or equal to 1 and less than or equal to 5.
In the self-cleaning mode, a is in a range of 5 or more and 10 or less.
In the high-temperature sterilization mode, the value range of a is more than or equal to 3 and less than or equal to 8.
And S17, continuously accumulating the defrosting interval time by taking the shortened accumulated defrosting interval time as a starting point, returning to the step S11, and continuously judging whether the accumulated defrosting interval time reaches the preset defrosting interval time.
In the embodiment, the specific value for shortening the current accumulated defrosting interval time is positively correlated with the running time of the special working mode, the actual accumulated defrosting interval time is prolonged according to the time working condition of the air conditioner, and the control method is accurate and intelligent.
Of course, the method for shortening the current accumulated defrosting interval is not limited to this, and the control method of the present invention may also directly subtract the preset shortened experience value from the current accumulated defrosting interval after exiting the special operating mode according to the preset determined shortened experience value.
The second embodiment:
the main differences between the second embodiment and the first embodiment are: when the accumulated defrosting interval time reaches the preset defrosting interval time, the defrosting mode is not directly started, but the condition required to be met by starting the defrosting mode is limited. Only the difference steps between this embodiment and the first embodiment will be described in detail below, and the same steps will not be described again.
In addition to the steps of the first embodiment, the defrosting control method of this embodiment further includes the following steps:
when the accumulated defrosting interval time reaches the preset defrosting interval time, acquiring outdoor environment temperature and outdoor unit defrosting temperature;
comparing the magnitude relation between the outdoor environment temperature and the outdoor environment temperature threshold value;
comparing the magnitude relation between the defrosting temperature of the outer unit and the defrosting temperature threshold of the outer unit;
and determining whether to start the defrosting mode or not according to the comparison result of the outdoor environment temperature and the defrosting temperature of the outdoor unit.
Therefore, according to the comparison result between the outdoor environment temperature and the outdoor unit defrosting temperature and the corresponding threshold value respectively, whether the defrosting mode is started or not is determined according to the comparison result, the temperature condition is added besides the time condition, the defrosting mode can be started only when the two conditions are met, and the defrosting control of the air conditioner is more accurate and precise.
For ease of understanding, the detailed implementation steps of the second embodiment are described in detail below with reference to fig. 3. In addition, for the sake of brevity and intuition, the outdoor environment temperature and the outdoor unit defrosting temperature and the related mathematical relationship will be represented by different letters and mathematical symbols hereinafter and in fig. 3. Wherein, T o Represents the outdoor ambient temperature, T os1 Represents a first outdoor ambient temperature threshold, T os2 Represents a second outdoor ambient temperature threshold, T os3 Represents the third outdoor ring temperature threshold, T c Representative of the defrost temperature of the external unit, T cs1 First outdoor unit defrosting temperature threshold, T cs2 Represents a second external machine defrost temperature threshold, b, c, d, e, and f all represent constants, and T os1 >T os2 >T os3 ，T cs1 >T cs2 。
Referring to fig. 3, the defrost control method of the present embodiment includes the following:
when the accumulated defrosting interval time reaches the preset defrosting interval time in step S11, step S18 is performed.
And S18, acquiring outdoor environment temperature and outdoor unit defrosting temperature.
It should be noted that the outdoor ambient temperature is directly collected by the temperature sensor and transmitted to the controller of the air conditioner for use in the following steps. The defrosting temperature of the outer unit is acquired by a defrosting temperature sensor arranged on the outer unit, and the acquired defrosting temperature is transmitted to a controller of the air conditioner for subsequent steps.
S19, judging T o ≥T os1 Is there a Namely, the outdoor environment temperature T is judged o Whether it is greater than or equal to the first outdoor ambient temperature threshold T os1 。
It should be noted that, for the sake of simplicity and intuition, the following description only uses letters and mathematical symbols to represent the magnitude relationship between the outdoor ring temperature and the outdoor unit defrosting temperature and the corresponding threshold, and the description is not repeated.
If the judgment result in the step S19 is T o ≥T os1 Step S20 is executed, otherwise step S21 is executed.
S20, judging T c ≤T cs1 ？
If T c ≤T cs1 Then step S27 is executed to start the defrost mode.
S21, judging T os2 ≤T o <T os1 ？
If T os2 ≤T o <T os1 Step S22 is executed, otherwise step S23 is executed.
S22, judging T c ≤(bT o -c)/d？
If T c ≤(bT o C)/d, step S27 is executed, i.e. defrost mode is initiated.
S23, judging T os3 ≤T o <T os2 ？
If T os3 ≤T o <T os2 Executing step S24, otherwise executing stepS25。
S24, judging T c ≤(T o -e)/f？
If T c ≤(T o E)/f, step S27 is executed, i.e. defrost mode is initiated.
S25, judging T o <T os3 ？
If T o <T os3 Then step S26 is performed.
S26, judging T c ≤T cs2 ？
If T c ≤T cs2 Then step S27 is executed, i.e., the defrost mode is initiated.
It should be noted that the operating parameters represented by the letters above depend on performance parameters such as power of the controller, and are set by those skilled in the art according to actual products.
For example: first outdoor ambient temperature threshold T os1 =6 ℃, second outdoor ambient temperature threshold value T os2 = 15 deg.C, third room external ring temperature threshold T os1 = -23 ℃, and defrosting temperature threshold T of first external unit cs1 =6 ℃, second external machine defrosting temperature threshold T cs1 ＝-23℃，b＝5，c＝72，d＝7，e＝69，f＝4。
In summary, in the defrosting control method in this embodiment, the outdoor environment temperature threshold and the outdoor unit defrosting temperature threshold are refined into four temperature gears, and the outdoor environment temperature and the outdoor unit defrosting temperature acquired in real time are respectively compared with the four temperature gears, so that the condition for starting the defrosting mode is more specific, and the defrosting mode can be started at the best time.
The third embodiment:
in addition to the steps of the defrosting control method of the second embodiment, the present embodiment further defines a condition for starting the defrosting mode on the basis of the second embodiment.
Referring to fig. 4, the defrosting control method of the present embodiment further includes the steps of:
when the comparison result of the outdoor environment temperature and the outdoor unit defrost temperature satisfies the condition for starting the defrost mode, the defrost mode is not directly started but step S27 is performed.
S27, determining the comparison frequency i of the outdoor environment temperature and the outdoor unit defrosting temperature;
when it is determined that the number of comparisons i =1, that is, the number of comparisons is one, step S28 is performed;
when it is determined that the number of comparisons i =2, that is, the number of comparisons is two, step S29 is performed.
And S28, after the air conditioner is kept to operate in the current working mode for a preset time, returning to the step S18, and continuously acquiring the outdoor environment temperature and the outdoor unit defrosting temperature.
And S29, starting a defrosting mode.
In the defrosting control method, the outdoor environment temperature and the outdoor unit defrosting temperature are acquired twice at preset intervals, and are compared with the corresponding threshold values respectively, and the defrosting mode is started only when the comparison results of the two times are consistent, so that the problem of misjudgment caused by the influence of the comparison results due to the failure of the air conditioner or the accident of the external environment is solved, and the time for starting the defrosting mode can be judged more accurately.
It should be noted that, the specific value of the preset time period for keeping the air conditioner operating in the current operating mode in step S28 depends on performance parameters such as power of the air conditioner, and those skilled in the art may set the performance parameters according to product opportunities, for example, the specific value may be set to 5 minutes in this embodiment.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (9)
1. A defrosting control method of an air conditioner is characterized by comprising the following steps:
after the defrosting mode is exited, accumulating the defrosting interval time;
before the accumulated defrosting interval time reaches the preset defrosting interval time, if a special working mode is started, the accumulated defrosting interval time is suspended and the current accumulated defrosting interval time is stored;
after the special working mode is exited, the current accumulated defrosting interval time is shortened;
continuously accumulating by taking the shortened accumulated defrosting interval time as a starting point until the preset defrosting interval time is reached, and starting a defrosting mode;
the special working modes comprise an oil return mode, a self-cleaning mode and a high-temperature sterilization mode.
2. The defrost control method as defined in claim 1, wherein the step of "shortening the current accumulated defrost interval" comprises the steps of:
determining the running time of the special working mode;
shortening the current accumulated defrosting interval time by the following formula;
t as ＝tb s -ats
wherein, t as Representing the shortened cumulative defrost interval time, t bs Representing the current cumulative defrost interval time, t s Represents the operating duration of the special operating mode and a represents a constant greater than 1.
3. The defrost control method of claim 1 or 2, further comprising the steps of:
when the accumulated defrosting interval time reaches the preset defrosting interval time, acquiring outdoor environment temperature and outdoor unit defrosting temperature;
comparing the magnitude relation between the outdoor ring temperature and the outdoor ring temperature threshold;
comparing the magnitude relation between the outer unit defrosting temperature and the outer unit defrosting temperature threshold value;
and determining whether to start a defrosting mode or not according to a comparison result of the outdoor environment temperature and the defrosting temperature of the outdoor unit.
4. The defrost control method of claim 3 further comprising the steps of:
when the comparison result of the outdoor ring temperature and the defrosting temperature of the outdoor unit meets the condition of starting a defrosting mode, determining the comparison times of the outdoor ring temperature and the defrosting temperature of the outdoor unit;
when the comparison times are one time, the step of obtaining the outdoor environment temperature and the defrosting temperature of the outdoor unit is returned after the air conditioner is kept running in the current working mode for a preset time;
when the comparison times are two, the defrosting mode is started.
5. The defrost control method as claimed in claim 4, wherein the determining whether the defrost mode is activated based on the comparison of the outdoor ambient temperature and the outdoor unit defrost temperature includes the steps of:
when T is o ≥T os1 And T c ≤T cs1 When the defrosting mode is started, the defrosting mode is started;
wherein, T o Represents the outdoor ambient temperature, T c Representative of the defrost temperature, T, of the external unit os1 Represents a first outdoor ambient temperature threshold, T cs1 A first outdoor unit defrost temperature threshold.
6. The defrost control method of claim 5, wherein the determining whether to activate the defrost mode according to the comparison of the outdoor loop temperature and the outdoor unit defrost temperature comprises:
when T is os2 ≤T o <T os1 And T c ≤(bT o -c)/d, defrost mode is initiated;
wherein, T os2 Represents a second outdoor ring temperature threshold, b, c and d all represent constants, and T os1 >T os2 。
7. The defrost control method as claimed in claim 6, wherein the determining whether the defrost mode is activated based on the comparison of the outdoor ambient temperature and the outdoor unit defrost temperature includes the steps of:
when T is os3 ≤T o <T os2 And T c ≤(T o -e)/f, the defrost mode is activated;
wherein, T os3 Represents the third outdoor ambient temperature threshold, e and f both represent constants, and T os2 >T os3 。
8. The defrost control method of claim 7, wherein the determining whether to activate the defrost mode according to the comparison of the outdoor loop temperature and the outdoor unit defrost temperature comprises:
when T is o <T os3 And T c ≤T cs2 When the defrosting mode is started, the defrosting mode is started;
wherein, T cs2 Represents a second external machine defrost temperature threshold, and T cs1 >T cs2 。
9. An air conditioner characterized in that a controller of the air conditioner is configured to execute the defrosting control method according to any one of claims 1 to 8.
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